srcタグ抽出の正規表現(php)

phpでsrc=のURL先を抽出する正規表現

$pettern1    = "/<img.*?src[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^\"'>[:space:]]{0,}.*?[^\"'>[:space:]]{0,}.*?)[\"']{0,}[[:space:]]{0,}.*?>/is";
$pettern2    = "/<a.*?href[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^\"'>[:space:]]{0,}.*?[^\"'>[:space:]]{0,}.*?)[\"']{0,}[[:space:]]{0,}.*?>(.*?)<\/(.+?)/is";
$pettern3    = "/<script.*?src[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^\"'>[:space:]]{0,}.*?[^\"'>[:space:]]{0,}.*?)[\"']{0,}[[:space:]]{0,}.*?>/is";
$pettern4    = "/<area.*?href[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^\"'>[:space:]]{0,}.*?[^\"'>[:space:]]{0,}.*?)[\"']{0,}[[:space:]]{0,}.*?>/is";
$pettern5    = "/<link.*?href[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^\"'>[:space:]]{0,}.*?[^\"'>[:space:]]{0,}.*?)[\"']{0,}[[:space:]]{0,}.*?>/is";
$pettern6    = "/@import.*?u?r?l?\(?[\"']{0,}(.*?[^\"';\)]{0,}.*?[^\"';\)]{0,}.*?)[\"']{0,}\)?;?/is";
$pettern7    = "/background\-image[[:space:]]{0,}:[[:space:]]{0,}url\([\"']{0,}(.*?[^;\)\"'>]{0,}.*?[^;\)\"'>]{0,}.*?)[\"']{0,}\);?/is";
$pettern8    = "/background[[:space:]]{0,}=[[:space:]]{0,}[\"']{0,}(.*?[^;\)\"'>]{0,}.*?[^;\)\"'>]{0,}.*?)[\"']{0,}/is";
$pettern9    = "/background[[:space:]]{0,}:[[:space:]]{0,}url\([\"']{0,}(.*?[^;\)\"'>]{0,}.*?[^;\)\"'>]{0,}.*?)[\"']{0,}\)/is";